#include<stdio.h>
#include<unistd.h>
int Sum(int s,int e)
{
    int sum = 0;
    int i = s;

    for(;i<=e;i++)
    {
        sum += i;
    }
    return sum;
}

int main()

{

    chdir("/home/112");
 //   printf("program is running\n");
 // int start = 1;
   // int end = 100;
   //var int result = Sum(start,end);
 
    //usr printf("program is done ,result: %d\n",result);
}
